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Experimental verification of bidirectional modular multilevel cascaded converter suitable for applying 120‐degree discontinuous pulse width modulation maximum
Author(s) -
Oi Kazunobu,
Urushibata Shota,
Tadano Yugo,
Sato Yukihiko
Publication year - 2021
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.23340
Subject(s) - snubber , pulse width modulation , insulated gate bipolar transistor , capacitor , transformer , converters , electronic engineering , voltage , modular design , harmonics , engineering , electrical engineering , inverter , topology (electrical circuits) , computer science , operating system
Modular multilevel cascaded converters (MMCCs) have advantages in the application of high or medium voltage without transformers. They can also generate high‐quality voltage with fewer harmonics. Their unique merits make them leading technology candidates for high/medium voltage applications. However, a concern still exists that the number of parts may be increased. In this study, an MMCC topology using high‐voltage IGBT (HV‐IGBT) with snubber capacitor connected in parallel as a cell module arm is proposed, by which the number of cells can be halved and conduction loss can be significantly reduced owing to the output current flowing through the HV‐IGBT in one‐third of the cycle. Meanwhile, the proposed control stratagem can control the cell capacitor voltage, suppress the HV‐IGHT surge voltage, and avoid short‐circuiting of the snubber capacitor by circulating current. This study reports the evaluation results of capacitors and the experimental results of bidirectional active power conversion operation.